Cam for sliding screw-operated vise jaws to final clamping position



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CAM FOR SLIDING SCREW-OPERATED VISE'JAWS TO FINAL CLAMPING POSITION Filed Aug. 13, 1948 2 Sheets-Sheet l JNVENTOR.

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CAM FOR SLIDING SCREW-OPERATED VISE-JAWS' TO FINAL CLAMPING POSITION Filed Aug. 13, 1948 2 Sheets-Sheet 2 I PAL HM W IN VEN TOR.

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ATTORNEYS Patented Aug. 28, 1 951 CAM FOR' SLIDING SCREW-OPERATED VISE *JAWS' T FINAL CLAMPING POSITION Pliilip Hartmanm R-a'cin :mann' Manufacturin :La corporation: of: Wis

e, Wis.-,= assignor to fia'rtg- Som-p'a'ny, Racine, 'Wis cousin Apiilication 'August 13, 1948ISerial No. 43,967

1 Claim.

The" invention relates'tovi'ses for production work and more particularly to a'vi'se of the' quick acting type.

The object of the invention is to provide a vise in which the movable jaw has a wide range of initial adjustment, and after such adjustment for gripping work pieces of the same size, said jaw may be quickly brought into gripping engagement with the work piece by merely swinging a lever having an eccentric or wedge which moves the jaw to a work gripping and locked position. According to the present invention, the quick acting mechanism acts on the nut in which the lead screw for initially adjusting the movable jaw is mounted.

The invention further consists in the several features hereinafter set forth and more particularly defined by claim at the conclusion hereof.

In the drawings:

Fig. 1 is a side elevational view of a vise embodying the invention;

Fig. 2 is a plan view of the vice;

Fig. 3 is a vertical sectional view taken on the line 33 of Fig. 2, showing the vise in open position, parts being broken away and parts being shown in section;

Fig. 4 is a view similar to Fig. 3 showing the vise in closed position;

Fig. 5 is a bottom plan view as viewed on the line 5-5 of Fig. 3, parts being broken'away;

Fig. 6 is a detailed vertical sectional view taken on the line 6-6 of Fig. 4.

Referring to the drawings, the numeral 1 designates the fixed jaw and 8 the movable jaw of the vise.

The fixed jaw 1, a metal casting, forms a supporting frame and has a base portion 9 with notched ends and sides ID for bolting it onto the bed or table of a machine tool in connection with which the vise may be used, and it has a hollow centrally disposed boss or housing II at its rear end. Spaced cylindrical horizontally disposed steel guide bars l2 for the movable jaw are suitably anchored at their front ends in the jaw and. at their rear ends in lugs or uprights l3 projecting upwardly from the base and extending to the housing H. The movable jaw 8 is provided with spaced openings to receive the bars l2, so that said jaw may move lengthwise of said bars with its clamping face disposed parallel to that of the fixed jaw.

Hardened steel jaw plates 14 are mounted in recessed portions of the jaws and secured thereto by screws I 5.

"Forinitialadjustment'ofthe movable jaw 8 relative'to' -thefixed 'jaw, a nut member I 6 is disposed within the housing and has a bore ll threaded to take a threaded lead screw l8 loosely slidably mounted in openings H in the housing and which is provided with a hand turning knob 19 at its outer end and at its inner end is anchored for turning movement in the jaw 8. For this purpose the cylindrical end 20 of the screw it is rotatably mounted in a bearing bushing 2! which has a drive fit in bore 22 of the jaw 8 and is held against lengthwise movement in said bushing by a retainer ring or collar 23 which engages in an annular groove 24 in the end 20 when said collar abuts the inner end of said bushing, the collar being assembled in place before the bushing 2| is anchored to the jaw 8. With this construction turning of the lead screw I8 in either direction will cause it to move lenghtwise and with it the jaw 8. This initial adjustment by the hand or lead screw is made for any given size of a number of work pieces to be handled, the jaws being then in the position shown in Fig. 8. Thereafter, the jaws are brought into clamping contact with the work through the quick acting mechanism which acts to move the nut I 6, screw l8, and jaw 8 as a unit.

The quick acting mechanism includes a shaft 24 journalled in the housing II and carrying an exteriorly disposed operating lever or crank 25. The shaft 24 is provided with a groove or slot 25 in which a tongue 21 on the nut is disposed and centered and which tongue is normally urged against a wedge surface 28 forming the bottom of the groove 26 by a spring 28 interposed between the nut and the front side of the housing and supported by a U-shaped bracket 30 mounted on a bottom plate 3| secured to the frame of the vise by screws 32. After the initial adjustment, the wedge surface 28 engages the tongue 21 in the position shown in Fig. 3, and the lever 25 is then disposed in the upper position shown in dotted lines. Then when the operator presses down on the lever 25 to move it to the position shown in Fig. 4, the wedge 28 acts on the tongue 21 to push the nut l6 forwardly and with it the screw l8 and jaw 8, thus moving said jaw relative to the fixed jaw to firmly clamp the work W between the jaws as shown in Fig. 4.

To prevent chattering of the shaft 24 a friction brake in the form of a block 33 urged against the shaft 24 by a spring 34 supported on the plate 3| may be used.

The above described construction provides a quick acting vise having a fixed position for muld tiple operation work, which position can be fixed to any position Within the limits of the efiective length of the lead screw 18.

When the lever 25 is moved upwardly from the clamping position shown in Fig. 41 to the position shown in Fig. 3, the spring 29 acts to return the jaw B to its open position.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts except in so far as such limitations are included in the appended claim.

What I claim as my invention is:

In a vise, the combination of a fixed jaw, a movable jaw slidably guided relative to said fixed jaw, means including a screw shaft and a nut for initially adjusting said movable jaw relative to said fixed jaw, a housing for said nut spaced from said fixed jaw, an oscillatory shaft journalled in said housing and provided with a notch whose bottom forms a wedging surface, said nut having a tongue interfitting with said notch and engageable with said wedging surface on the movement of said shaft for moving said nut, screw shaft and movable jaw to a work clamping position, and spring means in said housing acting on said nut on release of pressure from said wedging surface for returning said nut and screw shaft and movable jaw to a work release position.

PHILIP HARTMANN.

REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name Date 1,277,324 Larsson Aug. 27, 1918 1,732,445 La Pointe Oct. 22, 1929 2,424,313 Heinrich July 22, 1947 2,443,670 Weber June 22, 1948 FOREIGN PATENTS Number Country Date 622,641 France Mar. 7, 1927 

